A small minority of the scopes are properly aligned for the weapons. and each weapon has a set of aligned/misaligned scopes. Some are almost "zeroed" and the shot hits higher than the reticle. some like all scopes for the l115a3 hit lower than the reticle making the gun near useless sadly, the ACOG and digital scope for most rifles hits slightly to the right so when your reticle is lined up perfectly for a headshot, the shot buzzes by the right side of his head.
Some are hilariously unusable. such as the g28 scope for the g28 rifle which basically, you have to aim with the bottom of the scope to hit at point blank. Its such an irony the scope cant even function for the gun it was made for.